ON LEAF-ARRANGEMENT 



913 



CH. XIV] 



simplicity . by the corkscrew spirals, or helices, which mark the 

 position of the leaves on a cylindrical stem or tapering fir-cone ; or, on 



Fig. 448. A giant sunflower, Helianthus maximus. From H. A. Naber, 

 after M. Brocard. 



the other hand, we may be more attracted by, and may regard as of 

 greater importance, the spirals traced by the curving rows of florets 

 in the discoidal inflorescence of a sunflower. Whether one way or 



